Choke detector



July-15 1924. J. PRUSH ET AL CHOKE DETECTOR Filed April 27, 1923 2 Sheets-Sheet 1 56 q .3.5 i $016177 .40

WITNESSES lmlm a ATTORNEYS k R g mg W a m. A .5, Q... z @PQ w J v im BRUSH ET AL CHOKE DETECTOR FiledApril 7-, 1923 July 15 1924.

ATTORNEYS Patented July 15, 1924.

UNITED STATES PATENT CHOKE DETECTOR.

Application filed April 27, 19 23. eria1 fie. $5.674.

To aZZ whom it may 0072 0677! p 7 Be it known that we, J osnrH PRUSH and ALvin B. LANIGAN, both citizens of the United States, and residents of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Choke Detector, of which the following is a full clear, and exact description;

This invention relates to an improvement in detecting devices for folding machines, feeding machines and other machines used in the printing and allied trades and has for an object to provide an improved con' struction which will act to shut off the power from the machine immediately after any given sheet of paper has moved out of its proper registry.

Another object of the invention is to provide a detecting structure for folding ma; chines, feeding machines and the like which acts on the rear edge of paper passing through the machine whenever the particular sheet of paper is moved out of its correct position according to the timing of the machine. v v

A further object of the invention is to provide an attachment which actson the paper passing" through the machine when the paper is moved out of its correct position, regardless of whether the paper is crumpled or straight and when so acting causes the stoppage of the entire machine.

A still further object, more specifically, is to provide a detecting mechanism includa moving arm designed to strike sheets of paper passing through the machine in case they are out of their correct position and a readily adjustable cam for connecting the arm to the moving parts of the machine so as to readily time the movement of the arm to the movement of the paper passing through the machine.

In the accompanying drawings Figure l is a fragmentary top plan view of a foldingmachine of a well known type, together with an embodiment of the inventiOTl. I

Figure 2 is a sectional View through Fig-- ure; 1 approximately on line 2 2.

Figure 3 is airagmentary sectional view similar to the mechanism shown at the right upper part of Figure 2 but with thedetector aiiii in a lowered aiid detedtingposjitien.

Figure i is, a view similar to Figure 3 bilt showing the arm in its eitlffie lowered position which it assumes after the passage of each sheet of paper when the paper is in its correct position.

Referring to the accompanying drawings by numeral, 1 indicates a folding machine designed to fold sheets or pieces of paper and in order to do so the sheets are fed from a given supply to the folding mechanism. The feeding mechanism and the folding mechanism form no part of the present invention except in conection with the detecting' and stop mechanism hereinafter fnll described. a a

As indicatect in Figure ,1', the various sheets of pa er 2 are fed along by Belts" 3' to a iven point andthen the sheets of paper automatically move over onto the other belts 4: and finally onto the foldiiigjmechanisni It is very desirable and usually necessary tohave the sheets 2 fed correctly. onto the folding mechanism in order that they may be properly folded and also in order that the machine will not become choked. If the sheets should become crumpled, they would not be properly moved to the folding mechanism 5 and, consequently, the succeeding sheets would pile up and chokthe machine unless the machine was stopped quickly.

In machines of this type; it is dithciilt and almost impossible, for a workman to continually observe whether or not the va rio'us sheets of paper are in their respective correct positions as the machines often have mere than one set ortrenspoitin belts 3 and 4 as indicated in F igure 2. Heretofofe, attenijts have been madeto operate the top motion mechanism hilt these attempts have been limited to means. acti'iated by a criinipled' paper, as for. instance the sheet 2- (F ignr'e 2.) Hereto'fere, small rods or arfms extend over the belts 4 and when a crumpled sheet, similar to sheet 2, passes thereover, these arms are moved and the circuit is closed for shutting off the power to the machine. This would occur even if the crumpled sheet was in its correct position. However, when a sheet moves diagonally through the machine or is out of position these former detectors will not operate and, consequently, tiie'sheet will cause the ma chine to en ine tea; greater or less extent; In the present invention, means have been provided for immediately detecting a sheet when out of position whether crumpled 0i" sinooth. In the accompanying: drawings, one einhodimnt of the invention has been disclosed which has been applied to a well known type of folding machine but it is evident that it may be applied to other types of folding machines and other machines of a similar nature which feed the paper to a desired point.

As indicated in Figure 2, a pair of contacts 6 and T are provided, said contacts being connected through suitable wires 3 and 9 with the windings 10 of the magnetically operated number. A suitable source of current 11 is interposed in the circuit so that when the contacts 6 and 7 are in engagement, the magnet 10 will be energized and will shift the arm 12 to move it away from the contact members 13 and 1%. These contact members form part of a circuit of the motor 15, which motor is connected in any desired manner with the machine 1 for driving the same. It will thus be seen that whenever the contacts 6 and 7 are closed, the motor 15 will be immediately disconnected from its source of power and, consequently, the machine will stop. Different forms of contacts 6 and 7 and as sociated parts might be provided without departing from the spirit of the invention but the arrangement shown in Figure 2 has proven satisfactory.

It will be noted that the contact 6 is connected with or formed integral with a small shaft 16 which is provided with an enlargement 17, which enlargement is struck by the shoe 18, which shoe is preferably a flat strip of spring metal easily moved and acting to give a comparatively large contact surface to the member 17. The contacts 6 and 7 and also the members 16, 17 and 18, are all mounted on an arm 19 which is rigidly secured to a fitting 20 and said fitting in turn is rigidly secured to a shaft 21 by a set screw 22 or other suitable means The arm 19 is preferably of spring metal, though not necessarily so. An arm 23 is also rigidly secured to the shaft 21 in any desired manner, said arm being pivotally connected with a link 2a, which link in turn is connected with an auxiliary arm 23 rig idly secured to the shaft 25, which shaft carries an auxiliary arm 19 and parts identi cal with. the parts carried by arm 19 but operating in connection with the transporting belts 26 instead of the transporting belts 1. The arms 23 and 23 are of the same length and, conseqnently,act together so that the arms 19 and 19 are swung simultaneously and for the same distance. The respective shafts 21 and are journaled in suitable bearings in the machine 1 but driving mechanism is connected to shaft 21 only as the power is transmitted through the link 24 and associated parts to shaft 25. An arm or lever 27 is rigidly secured in any desired manner to shaft 21 and is pivotally connected at its outer end with a link 28,

which in turn is pivotally connected at to lever 30, pivotally supported at 31 in any suitable manner. A retractile spring 32 continually acts on the lower section of lever 30 to normally hold the arms 19 and 19 elevated as illustrated in Figure 2. An actuating rod 33 is pivotally connected at 34: to the lower section 30 of lever 30 and is provided with a fitting 35 at the end which is supplied with a forked or yoke member 36 and with an anti-friction roller 37 journaled on a suitable pin 38. The roller 37 acts on the periphery of the cam 39 and as this cam is formed with an arc-shaped section 10 and a cam face 11, the rotation of this cam will cause the lever 30 and associated parts to remain stationary for part of the revolution of the shaft 42 and to move for the remaining part of the revolution of shaft 42. hen the cam 39 moves around until the cam face 11 approaches the roller 37, the spring 32 will begin to act and will cause said. roller to follow the cam face ll and, consequently, to cause the lever 30 to swing in such direction as to swing the arms 19 and 19 clownwardly as illustrated in Figure 1.

hen the paper is in the correct position as illustrated in Figure a, the arms 19 and 19 will move downwardly but will not strike the paper and, consequently, will not close the contacts 6 and 7. However, if the paper is in a wrong position, whether cru1npled or straight, the shoe 18 will strike the same as illustrated in Figure 3 and the continued downward movement of the arms 19 and 19 will quickly cause a closing of the contacts 6 and 7 which in turn will quickly cause the opening of the circuit of motor 15. Preferably, the arms 19 and 19 are set to move downwardly to the position shown in Figure 4 immediately after the rear edge of the paper has passed, but if desired, it could be set to move downwardly and then back innnediately before the paper approached the contact members 6 and 7. In order to provide the desired adjustment so to cause the arms 19 and 19 to move downwardly at the correct time, an auxiliary cam 4:3 is positioned adjacent cam 39, said auxiliary cam a3 being provided with an arc-shaped operating face 14c arranged on the body 415, which body is preferably provided with an aperture through which the shaft 42 extends. An arc-shaped slot 46 is arranged in body for accommodating the bolt 17 carried by the cam 39, which bolt acts to lock the bodyefiin any desired adjusted position in respect to cam 39.

When the parts are set as shown in Figure 2, the auxiliary cam 43 is not functioning but if it should be swung around towards the right until it overlaps the cam face 41 somewhat, it would then begin to function and cause the arms 19 and 19 to remain elevated for a greater length of time. lVhere a large sheet is being fed by the machine, it is necessary to move the auxiliary cam 43 around so as to hold the arms 19 and 19 elevated until the rear edge has passed the contacts. After the cam 39 and the auxiliary cam 43 have been properly set, the machine will continue to function properly without any further attention or consideration by the operator.

In case a sheet of paper should move through the machine at an angle or out of position, the contact shoe 18 will strike the same as shown in Figure 3, and the machine will be immediately stopped. Quite often, the sheet which has caused the stoppage is not injured and may be straightened and the machine again started without the loss of a single sheet. Heretofore, the paper would pile up at a given point until observed by the operator or until a sufficient amount had piled up to operate a swinging series of arms or grate as above mentioned. It will be thus noted that instead of piling up a large amount of sheets which are very difficult to remove and which quite often throw off the various belts 4 and 26, a structure has been presented which will not affect the belts a and 26 or any other parts of the machine in an objectionable manner but will immediately throw ofi the power when a sheet passes the contacts 6 and 7 out of proper time.

lVhat we claim is 1. A choke detector for paper feeding machines, folding machines and the like, comprising a pair of electrical contacts normally spaced apart, a swinging arm adapted to move both of said contacts across the path of the paper passing through the machine so as to engage the paper and be closed thereby in case the paper is out of its correct position, a rock shaft for actuating said arm, a system of levers, links and arms for actuating said rock shaft, a cam for actuating said levers in one direction, and a spring for actuating the levers in the opposite direction.

2. A choke detector for paper feeding machines, paper folding machines and the like, comprising a swinging arm, a pair of normally spaced contacts carried by said arm, and means for operating said arm, said means including a cam formed with an arcshaped section and a cam face, and an auxiliary adjustable cam provided with an arcshaped face adapted to be moved to in effect shorten and lengthen the arc-shaped surface of said cam.

3. A choke detector for paper feeding machines, paper folding machines and the like provided with a plurality of substantially parallel feeding structures, comprising a swinging arm for each of the feeding structures, a pair of spaced electrical contacts carried by each arm, a rock shaft for supporting each of said arms, means for connecting the rock shafts so that they will operate in unison, power means for actuating one of said rock shafts so as to swing said arms in proper time to the movement of paper through the machine, and means actuated by the closing of either of said contacts for shutting 0H power to said in,- chine.

4. A choke detector for paper feeding machines, paper folding machines and the like provided with a feeding structure, comprising a swinging arm for the feeding structure, a pair of spaced electrical contacts carried by said arm, a rock shaft for supporting said arm, power means for actuating said rock shaft so as. to swing said arm in proper time to the movement of paper through themachine, and means actuated by the closing of said contacts for shutting off power to said machine.

5. A choke detector for folding machines and the like, comprising an arm, means for moving said arm back and forth over a given course, said course intersecting the path over which paper in said machine passes as the machine functions whereby if a sheet of paper is crossing said course when said arm is moving across said path said arm will be arrested thereby, a pair of normally spaced contacts carried by said arm, said contacts being so positioned as to be closed by the action of said arm against said sheet of paper, and means actuated by the closing of said contacts for stopping the machine. Y

JOSEPH PRUSH. ALVIN B. LANIGAN. 

